K.M.
A nutritionist had told me that if you eat a lot of sweets you could be low on protein. I've noticed that when I up my protein my sugar intake goes down.
On another note she did have one bowl of jell-o and if you didn't want her to eat it all you should have served her a bowl.
Also I don't think that I would punish her for eating it I would have been more mad if it got wasted.